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SSC Sample Paper SSC (Group-C) Sample Test Paper-3

  • question_answer
    A certain sum doubles itself in 7 years at simple interest. In how many years will the same sum under the same interest rate become 4 times of itself?

    A)  14                

    B)  28

    C)  21                

    D)  10

    Correct Answer: C

    Solution :

     Case I, Interest = Principal Rate \[=\frac{\text{Interest }\!\!\times\!\!\text{ 100}}{\text{Principal}\,\text{ }\!\!\times\!\!\text{ Time}}=\frac{100}{7}%\] per annum Case II, Interest =\[3\times \] Principal Time  \[=\frac{Interest\times 100}{Principal\times Rate}\] \[=\frac{3\times 100}{\frac{100}{7}}=3\times 7=21\] years


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